Chemistry is the study of substances and bonds. There are two different sorts of elements: metals and bases.
0.20 atm is the right response.
What exactly is partial pressure?Each gas in a mixture of gases has a partial pressure, which is the notional pressure of that gas if it occupied the complete volume of the initial mixture at the same temperature on its own.
A mixture of ideal gases has a total pressure equal to the sum of its constituent gases' partial pressures.
Consider the subsequent response.
Z = W(g) + X(g) Y(g) (g)
Using an ICE chart, we can determine the partial pressure of Z at a moment we'll refer to as the equilibrium.
We label each row with the pressure or change in pressure for each of the three stages: Initial, Change, and Equilibrium.
Y(g) + Z = W(g) + X(g) (g)
I 1.20 1.60 0 0 C -x -x +x +x E 1.20 -x 1.60 -x x x
The partial pressure of W at equilibrium is 1 atm.
As a result, Z has a pressure of x = 0.20 atm.
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the molar heat of combustion of gaseous cyclopropane is -2089 kj>mol; that for gaseous cyclopentane is -3317 kj>mol. calculate the heat of combustion per ch2 group in the two cases, and account for the difference.
Answer: 24.41 The molar heat of combustion of gaseous cyclopro- pane is -2089 kJ/mol; that for gaseous cyclopentane is -3317 kJ/mol. Calculate the heat of combustion per CH2 group in the two cases, and account for the difference.
Explanation:
rank the labeled protons (ha-hd) in order of increasing acidity, starting with the least acidic.
[tex]H_{b} < H_{c} < H_{a} < H_{d}[/tex] is the increasing order of acidity in given compound.
where [tex]H_{b}[/tex] is least acidic and [tex]H_{d}[/tex] is most acidic
Higher the stabilization of negative charge produced as a result of removal of proton higher the acidity. [tex]H_{d}[/tex] is most acidic because after removal of [tex]H_{d}[/tex] ,negative charge on oxygen is resonance stabilized by (c=o) group .
similarly after [tex]H_{d}[/tex] , [tex]H_{a}[/tex] is most acidic because negative charge on oxygen is stabilized by conjugation with benzene.
After [tex]H_{a}[/tex] , [tex]H_{c}[/tex] is more acidic than [tex]H_{b}[/tex] because negative charge on oxygen is more stabilized while negative charge is less stabilized in carbon.
So to decide the order the stabilization of negative charge produced as a result of removal of proton is checked.
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complete question:
rank the labeled protons (ha-hd) in order of increasing acidity, starting with the least acidic for below figure.
given the densities of uranium (19.05 g/cm3 ) and deuterium oxide (1.11 g/cm3 ), what is the edge length of the cube of uranium?
A small cube of solid uranium metal, measuring about two inches on each side and weighing less than 2.5 kilos, has been housed at the Pacific Northwest National Laboratory (PNNL) for many years.
A Heisenberg cube is what?
More than 600 "Heisenberg cubes," named after Werner Heisenberg, one of the German physicists who developed them, were taken from a top-secret underground laboratory at the end of World War II and brought to the United States. These cubes were essential to the Nazis' plans to build both a nuclear reactor and an atomic bomb.
Is uranium available for purchase?
However, the truth is that you may purchase uranium ore without a special permit from websites like Amazon or Ebay. The most prevalent isotope of the element, uranium-238, is only purchased for research purposes.
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compound contains platinum(ii), with two ammonia molecules per platinum. the compound also contains two moles of chloride (cl-) per mole of platinum. treatment of the compound with silver nitrate does not result in the precipitation of silver chloride. the formula of the compound is
The compound treatment on with silver nitrate does not result in the precipitation of silver chloride. the formula of the compound is [Pt(NH₃)₂Cl₂].
The contains the platinum(II) and the two ammonia molecules per the platinum. the compound contains the chloride ions per mole of the platinum. the compound does not give precipitate of silver chloride on treating with the silver nitrate is [Pt(NH₃)₂Cl₂].
The compound will react with the silver nitrate if the Cl is out of the coordination sphere. the NH₃ is the monodentate ligand and Cl is also the monodentate ligand. the total ligand is 4 coordinated ligand. the oxidation state of Pt is +2
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marissa is investigating a biochemical reaction involving carbon compounds. the reaction requires a specific enzyme. what is the role of the enzyme in this reaction?
Marissa is investigating a biochemical reaction involving carbon compounds. the reaction requires a specific enzyme. The role of the enzyme in this reaction is to speed up the chemical reaction.
Enzymes are protein molecules. Enzymes lower the activation energy necessary for the reaction to occur. This allows the reaction to happen more quickly than it would without an enzyme present.
Any reaction requires a specific enzyme. That specific enzyme allow the
reaction to speed up, otherwise there is no change in reaction speed.
Enzymes work by decreasing the activation energy required to start biochemical reactions.
So, the enzyme role of enzyme is to speed up the reaction ad decreasing the activation energy of the reaction.
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The mass of 560 cm3 (at STP) of an unknown gas is 1.60 g. This gas could becarbon dioxide (44 g/mol)hydrogen (2 g/mol)sulfur dioxide (64 g/mol)chlorine (71 g/mol)oxygen (32 g/mol)
The mass of 560 cm³ (at STP) of an unknown gas is 1.60 g. This gas is sulfur dioxide (64 g/mol)
The STP condition in an ideal gas is the standard state of the gas. The STP state is defined as the state of standard pressure and temperature. The standard pressure at STP is 22400 cm³ for every 1 mol.
→ 560 gases will have 1/22400 x 560 = 0.025 moles.
Mass = 1.60 g
So:
Number of mols = Mass/Molar Mass
Molar mass = Mass/mols
Molar mass = 1.60 g/0.025 mol
Molar mass = 64 g/mol
So, this gas will be sulfur dioxide.
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why wasn't wegner's theory of continental drift accepted during his lifetime?
Answer:
Wegener's theory was primarily rejected since he offered no explanation for how the continents might move.
Explanation:
The theory also went against many ideas widely accepted in the community.
cis-1,2-dimethylcyclohexane always has one axial and one equatorial methyl group.
The answer is True.
--In cis-1,2-dimethylcyclohexane, one methyl group is axial and one methyl group is equatorial in both ring flip conformers, so neither conformer is more stable than the other.
What is Isomer?
--In chemistry, isomers are molecules or polyatomic ions with identical molecular formulae – that is, same number of atoms of each element – but distinct arrangements of atoms in space.
--Isomerism is existence or possibility of isomers. Isomers do not necessarily share similar chemical or physical properties
-- Conformational isomerism is a form of stereoisomerism in which the isomers can be interconverted just by rotations about formally single bonds.
Stereochemistry
Stereochemistry is an isomerism formation whereby the molecules have similar formulation of the molecules and bonded atoms sequence,
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the bond between adjacent amino acids is a(n) ________ bond.
The bond between adjacent amino acids is a covalent peptide bond. A protein is made up of a lengthy chain of amino acids that are connected by peptide bonds.
A water molecule is removed during a biological process that links the carboxyl group of one amino acid to the amino .Peptide bonds are the connected that hold the amino acids of a peptide together in a particular order. Two atoms share an electron pair equally in a covalent link. Peptide (amide) and disulfide links between amino acids, as well as C-C, C-O, and C-N bonds within amino acids, are examples of significant covalent bonds.
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when 1.9 mol of copper (ii) hydroxide decomposes to form copper (ii) oxide and water, how many moles of water are formed
When 1.9 mol of copper (ii) hydroxide decomposes to form copper (ii) oxide and water, moles of water that formed are 1. 9 moles
The moles that formed can be calculated as follows:
first we should write the balanced reaction
Cu(OH)₂ → CuO + H₂O
The following numbers of moles of each component are involved in the reaction according to reaction stoichiometry, which describes the relationship between the amounts of reagents and products in a chemical reaction, with unitary method we can calculate the moles of H₂O:
Cu(OH)₂: 1 mole
CuO: 1 mole
H₂O: 1 mole
so, 1 mole of Cu(OH)₂ produce 1 mole of H₂O
If 1.9 mol of copper (ii) hydroxide decomposes to form copper (ii) oxide and water so the moles of H₂O is
Moles H₂O = 1/1 x mole of Cu(OH)₂ = 1/1 x 1.9 mol = 1.9 moles
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how many moles of carbon dioxide are produced when 19.3 mol of propane gas is burned in excess oxygen?
(a) 57.9 mol moles of carbon dioxide are produced when 19.3 mol of propane gas is burned in excess oxygen.
The combustion reaction can be defined as the complete oxidation of any hydrocarbon; such reactions typically produce just carbon dioxide and water as byproducts.
The following is a representation of the propane combustion reaction, given the specified conditions:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
19.3 mol of propane is available for combustion.
Three moles of CO₂ were produced for every 1 mole of propane that was burned.
19.3 moles of propane will result in
3 × 19.3 = 57.9 mol
Thus, burning 19.3 moles of propane gas in extra oxygen produces 57.9 moles of CO₂.
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when an aromatic ring is deactivated, what happens to the rate of an electrophilic aromatic substitution reaction?
The molecular dipole moments of the substituents, which are used to quantify their effect on electron donating or withdrawing, may be associated with the deactivation of the aromatic ring toward electrophilic substitution.
A substituted ring with an activating group undergoes the EAS reaction more quickly than benzene. A substituted ring with a deactivated group, on the other hand, moves more slowly than benzene. By using resonance or inductive electron donation, activating groups accelerate the EAS reaction. The reaction rate with regard to benzene is increased or decreased by the group(s) linked to the aromatic ring. the new substituent's entrance position. Activating and deactivating groups, respectively, affect the rate of the electrophilic aromatic substitution process with regard to benzene..
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the half-life of the radium isotope ra-226 is approximately 1,599 years. what percent of a given amount remains after 800 years? round your answer to two decimal places.
The half-life of the radium isotope ra-226 is approximately 1,599 years. After 800 years, the remaining amount of the isotope is 70.71% of its initial quantity.
The decay formula is given by:
N(t) = No . (1/2)^(t/T)
Where:
N(t) = remaining quantity of the substance at time t
No = initial quantity
t = elapsed time
T = half-life
In the given problem:
t = 800 years
T = 1599 years
Therefore,
N(t) = No . (1/2)^(800/1599)
N(t) = 0.7071 No
N(t)/No = 0.7071 = 70.71%
Hence, the remaining amount of the isotope is 70.71%
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Atoms with a strong attraction for electrons they share with another atom exhibit.a. Trueb. False
Atoms with a strong attraction for electrons they share with another atom exhibit a strong covalent bond. This is true.
In a covalent bond, atoms share electrons in order to achieve a stable, lower-energy configuration. The strength of the covalent bond depends on the electronegativity of the atoms involved and the distance between them. Atoms with high electronegativities, such as oxygen and fluorine, tend to have a strong attraction for the electrons they share with another atom, resulting in a strong covalent bond.
In general, covalent bonds are relatively strong compared to other types of chemical bonds, such as ionic bonds or hydrogen bonds. They are also generally more directional, meaning that they are more directional and tend to be more directional in nature, which gives rise to the formation of specific geometries in molecules.
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Atoms with a strong attraction for electrons they share with another atom exhibit a strong covalent bond. This is true.
In a covalent bond, atoms share electrons in order to achieve a stable, lower-energy configuration. The strength of the covalent bond depends on the electronegativity of the atoms involved and the distance between them. Atoms with high electronegativities, such as oxygen and fluorine, tend to have a strong attraction for the electrons they share with another atom, resulting in a strong covalent bond.
In general, covalent bonds are relatively strong compared to other types of chemical bonds, such as ionic bonds or hydrogen bonds. They are also generally more directional, meaning that they are more directional and tend to be more directional in nature, which gives rise to the formation of specific geometries in molecules.
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a 35.5 ml sample of a concentrated solution of sodium hydroxide (4.25 m) is diluted to a concentration of 2.55 m solution of sodium hydroxide. what is the final volume?
In industrial, sodium hydroxide is a well-liked strong base. In order to make sodium salts and detergents, regulate pH levels, and synthesise organic compounds, sodium hydroxide is employed.
Since aqueous solutions are more convenient and affordable to handle, they are typically handled in bulk. When it is preferable to make a mixture more alkaline or to neutralise acids, sodium hydroxide is frequently utilised. For instance, sodium hydroxide is a drilling mud additive that is used in the petroleum sector to raise the viscosity and alkalinity of bentonite mud systems as well as to neutralize any acid gases that may be discovered in the geological formation as drilling advances. Salt also has a use.
M1V1 = M2V2
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calculate the equilibrium concentrations of reactant and products when 0.340 moles of are introduced into a 1.00 l vessel at 350. k.
Equilibrium concentrations of reactant and products
CH2Cl2=0.043
CH4=0.136
CCl4=0.136
When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate.
Explanation:
2CH2Cl2(g) =CH4(g) + CCl4(g)
Initial 0.315mol/L 0 0
Change -2x +x +x
Equib 0.315-2x x, x
Kc = [CH4][CCl4] / [CH2C2] (^2)
10.5 = x(^2) / (0.315 - 2x)^2
Work out the quadratic for x
10.5(4x^2 +0.099225 -1.26x) =x^2
3.90476x^2 -1.26x +0.099225=0
solve for x
discard the negative, can't have less than nothing.
x=0.136
0.315-2x = 0.315-2*0.136=0.043
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a reaction requires 25.0 g of sodium chloride. how many grams of a 10.0% solution would provide this amount of solute?
This amount of solute would be provided by 2.5 grams of a 10.0% solution.
% (w/v) formula:
[tex]% (\frac{w}{v}) = \frac{grams solute}{mL of solution} *100[/tex][tex](\frac{w}{v})[/tex]%[tex]= \frac{grams solute}{mLof solution} *100[/tex]
[tex]10[/tex]% [tex]NACl(\frac{g}{mL})= \frac{grams NaCl}{25mL} *100[/tex]
To calculate the mass in grams of NaCl required to create a 10% (w/v) NaCl solution, divide 10% by 100 and multiply the result by 25.
[tex]0.1*25 = 2.5g[/tex]
Salt, commonly known as sodium chloride (NaCl), is a substance that our body needs in order to absorb and transport nutrients, regulate blood pressure, maintain fluid balance, convey nerve messages, and contract and relax muscles.
Salt, or sodium chloride, accounts for about 75 to 90 percent of the sodium we consume. Our bodies require sodium, an essential mineral found in salt, for processes including blood pressure regulation and nutrition absorption. In addition to using salt to season food, clean household goods, and treat some medical conditions. Greater health issues like high blood pressure, heart disease, and kidney disease can be brought on by consuming too much salt. Your chance of developing those illnesses can be decreased by consuming less salt and consuming more potassium.
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write the ka2 reaction of sulfuric acid (h2so4) and the kb2 reaction of disodium oxalate (na2c2o4) and find their numerical values.
The rate constant for H2SO4 is 1.02 x 10-2 and the rate constant for Na2C2O4 is 5.3 X 10-5.
Ka2 is the second rate dissociation constant.
Kb2 is the second base dissociation constant.
H2SO4 is a di-basic acid. Whose Step wise dissociation is given below :
H2SO4 = H++ HSO4- ---(1)
Where the rate constant is ka1 .
Now Again HSO4- will dissociates in the following way :
HSO4- = H+ + SO42- -----(2)
Where the rate constant is Ka2 .
So , the equation for Ka2 is :
Ka2=[H+][SO42-]/[HSO4-]
The rate constant is 1.02 x 10-2.
Similarly step-wise dissociation of Disodium oxalate (Na2C2O4) is
Na2C2O4 = NaC2O4- + Na+ -----(1)
Second dissociation equation is
NaC2O4- = C2O42- + Na+ ----(2)
So , the rate constant for the second equation is:
Ka2=[Na+][C2O42-]/[NaC2O4-]
The rate constant is 5.3 X 10-5.
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a student is using a thermometer to measure the temperature of a salt water solution in a beaker. which set shows the safest and most accurate way to measure the temperature of the solution?
The safest and most accurate way to measure the temperature of the saltwater solution in a beaker is to use a thermometer with a protective sheath.
This type of thermometer is designed to protect the user from potential burns or injury and is also more accurate than other thermometers. The sheath should be made of a material that is heat resistant, such as stainless steel.
The thermometer should also be inserted into the solution as far as possible without touching the sides of the beaker. The thermometer should be left in the solution for a few minutes to allow it to reach equilibrium with the temperature of the solution before reading it.
Finally, the thermometer should be wiped off with a clean cloth before taking the reading. This will ensure the accuracy of the reading and reduce the risk of contamination.
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Why is the atomic mass of an element not a whole number?
It is based on the abundance of each isotope for an element.
Averages are rarely whole numbers.
It is equal to the number of protons and neutrons in the nucleus of the atom.
It is the atomic mass of the most common isotope for that element.
Answer: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element.
Explanation: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element. The atomic mass of an element is a weighted average of the atomic masses of all of its naturally occurring isotopes, taking into account the relative abundance of each isotope. For example, if an element has two isotopes, one with an atomic mass of 10 and the other with an atomic mass of 12, and the isotope with an atomic mass of 12 is more abundant, the atomic mass of the element will be closer to 12 than to 10. This means that the atomic mass of an element is usually not a whole number because it is an average of several different atomic masses.
Write word equations for any reaction that takes place in each of the following. If you would expect no reaction to occur.
say so.
a) Calcium is added to water.
b) Silver is added to dilute hydrochloric acid.
c) Lead oxide is heated with magnesium.
d) Calcium is heated in air.
e) Aluminium is heated with lead oxide.
f) Potassium is added to water.
g)Silver is added to copper sulfate.
h) Iron is added to sulfuric acid.
i) Magnesium is added to nitric acid.
i) Calcium is added to hydrochloric acid.
Answer:
a) Ca+ H2O = Ca(OH)2 + H2
Give a balanced chemical equation for the complete combustion of liquid C7H16. Include phase symbols in the answer.
Considering the definition of complete combustion, the chemical equation for the complete combustion of C₇H₁₆ is:
C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)
Definition of combustionCombustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. It is necessary to have several elements:
the fuel, which is the substance that is oxidized, can be in a solid, liquid or gaseous state and is made up mostly of carbon and hydrogen.the oxidizer, which is the substance that oxidizes the fuel, and is generally the oxygen found in the air.the activation energy, which is responsible for triggering the reaction.Complete combustionComplete combustions are those reactions in which the combustible material is completely oxidized (consumed) and other oxygenated compounds are produced, such as carbon dioxide (CO₂) or sulfur dioxide (SO₂), as the case may be, and water (H₂O).
In other words, complete combustion is the result of the complete oxidation of the fuel but not the disappearance of the oxidizer, that is, the oxidation of all the fuel occurs. For this it is necessary that the necessary quantities of oxidizer and dry air intervene. All complete combustion releases, as a product of the reaction, carbon dioxide (CO₂) and water in the vapor state (H₂O).
Complete conbustion of C₇H₁₆Considering the definition of complete combustion, you get:
C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)
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an aerosol can contains 400. ml of compressed gas at 5.20 atm. when all of the gas is sprayed into a large plastic bag, the bag inflates to a volume of 2.14 l. what is the pressure of gas in the plastic bag? assume a constant temperature.
The pressure in the plastic bag is equal to the initial pressure of the gas in the aerosol can, which is 5.20 atm.
What is aerosol?Aerosol is a type of suspension of fine particles or liquid droplets in air or another gas. Aerosols are typically created when a material is dispensed from a pressurized container and dispersed in the form of a spray, mist, foam, or foam. Examples of aerosols include dust, smoke, smog, fog, and spray paint. Aerosols can also be generated naturally, such as the spraying of saltwater droplets from the ocean’s surface. Aerosols are important for many scientific and industrial applications, such as in medicine, agriculture, and manufacturing. They are also essential in the production of consumer products such as cosmetics, paints, and cleaners. Aerosols also play a key role in the global climate system, as they affect the amount of sunlight that reaches the Earth’s surface and the formation of clouds. Aerosols are also used in research and environmental monitoring, as they can provide information about air quality and climate change.
This is because, as the gas is sprayed out of the can into the plastic bag, it expands and its pressure decreases. However, the pressure of the gas in the plastic bag will stay the same as the pressure of the gas in the aerosol can, so long as the temperature of the gas stays constant. This is because, according to the ideal gas law, the pressure of a gas is directly proportional to its temperature. Therefore, the pressure of the gas in the plastic bag will be 5.20 atm.
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given that kb for ch3ch2nh2 is 6.3 × 10-4 at 25 °c, what is the value of ka for ch3ch2nh3 at 25 °c?
Given that kb for ch3ch2nh2 is 6.3 × [tex]10^{-4}[/tex] at 25 °c, 1.58 x [tex]10^{-11}[/tex] is the value of ka for ch3ch2nh3 at 25 °c.
We can use the water auto-ionization constant,
which is written as Kw = Ka* Kb,
where Kw = 1.0 x[tex]10^{-14}[/tex] and ka and kb are the acid and base constants, respectively.
Another thing to keep in mind is that CH3CH2NH3+ and CH3CH2NH2 are an acid/conjugate base pair, so the above equation can be used.
Given the value for Kb, we must substitute it in and solve for Ka.
Ka = Kw/Kb
= 1.0 x [tex]10^{-14}[/tex] /6.3 x[tex]10^{-4}[/tex]
= 1.58 x[tex]10^{-11}[/tex]
Thus ,the value of ka for ch3ch2nh3 at 25 °c is 1.58 x[tex]10^{-11}[/tex]
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c. what would happen if the solutions were switch so that the first incubation was in the ph 8 solution and he second one was in the ph4 solution? explain your answer.
Nothing would happen if the solutions were switch so that the first incubation was in the pH 8 solution and he second one was in the pH 4 solution.
The H+ gradient would be in the wrong direction, ATP synthase would not work.
pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
pH is an important quantity that reflects the chemical conditions of a solution. The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals.
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carbon disulfide and chlorine react to yield carbon tetrachloride and disulfur dichloride. when the equation for this reaction is balanced, what is the coefficient in front of chlorine?
The balanced equation for this reaction is
CCl2S2 + 4Cl2 -> CCl4 + S2Cl2
The coefficient in front of chlorine is 4. This means that 4 moles of chlorine are required to react with 1 mole of carbon disulfide. This reaction follows the Law of Conservation of Mass, meaning that matter is neither created nor destroyed during a chemical reaction.
Chlorine is added to the reaction to ensure that the same amount of chlorine atoms are present on both sides of the equation. The chlorine atoms are necessary to convert the carbon disulfide into carbon tetrachloride and disulfur dichloride.
The chlorine atoms act as an oxidizing agent, breaking down the molecules of carbon disulfide and rearranging them into new compounds.
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hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. which statement must be true of the reaction?(1 point) responses
All other options given apply to exothermic reaction.
Since it is an endothermic reaction, More bond energy is absorbed on the reactants side than is released on the products side.
A chemical reaction is the process of chemical transformation of one group of chemicals into another group.
Classical chemical reactions involve changes that affect only the position of electrons in forming and breaking chemical bonds between atoms, with no changes in the nucleus (no changes in the elements present) and many If , it can be described by a chemical equation. Nuclear chemistry is a subfield of chemistry that deals with chemical reactions of unstable radioactive elements in which both electronic and nuclear changes can occur.
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how many grams of pbbr2 will precipitate when excess solution is added to 76.0 ml of 0.625 m solution?
The grams of PbBr₂ formed when excess solution is added to 76.0 ml of 0.625 m solution of Pb(NO₃)₂ are 17.4325.
The balanced chemical equation for the process is,
Pb(NO₃)₂(aq) + BaBr₂(aq) → PbBr₂(s) + Ba(NO₃)₂(aq)
So, from the reaction, we can see that when one mole of Pb(NO₃)₂ reacts, one mole of PbBr₂ precipitate is formed.
It is given that 76ml of 0.625 M Pb(NO₃)₂ is reacting,
We know,
Moles = Molarity x volume (in liters)
Now, putting the value to find the moles of Pb(NO₃)₂ soluton,
Moles of Pb(NO₃)₂ = 76 x 0.625/1000
Moles of Pb(NO₃)₂ = 0.0475 moles.
So, the mole of the precipitate formed is 0.0475 Moles.
Now, we also know,
Moles = Formed mass/Molar mass.
Molar mass of PbBr₂ = 367 g/mol.
Moles of PbBr₂ = 0.0475 moles.
Formed mass of PbBr₂ = 367 x 0.0475
Formed mass of PbBr₂ = 17.4325 Grams.
So, 17.4325 Grams of PbBr₂ is formed.
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The half-life of iodine-123 is 13.3 hours: How much ofa 25.0 mg sample will remain after 39.9 hours?
a)1.56 mg
b)3.13 mg
c)6.25 mg
d)25.0 mg
The half-life of iodine-123 is 13.3 hours: Option B: 3.13 mg of a 25.0 mg sample will remain after 39.9 hours.
Initial figure at a constant pace K. equivalent to two lawns over the half-life. One of the two over the half-life would be this. 13.3 hours is iodine 123. This would give us.05 hours to the negative one. then take K. T. out. So much homosexual is equivalent to the original dosage, which is 225 mg. Make a note of 25 mg, -15 hours, and 2 -1 39.9 hours. Therefore, using this would require using a lot of 25 3.22 -9.9 2.08 3 22 for more or less two months. A launch at 1.14. is the same as 1.14. You receive 3.13. It would be measured in milligrams. Thus, 3.13 mg would still be in my system after 39.9 hours.
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how much energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c?
The energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.
What is enthalpy ?The term enthalpy is defined as the sum of the system's internal energy and the product of its pressure and volume.
Ice warming Cs = 2.09 J/g∙°C
Enthalpy of fusion ∆H = 6.02 kJ/mol
Liquid water warming Cs = 4.18 J/g∙°C
Enthalpy of vaporization ∆H = 40.7 kJ/mol
Steam Warming Cs = 2.01 J/g∙°C
Step 1: Warm ice from −15.0°C to 0°C.
q1 = 470.25 joule
Step 2: Melt ice.
q2 = 5016.66
Step 3: Warm liquid water from 0°C to 45.0°C.
q3 = 2821.5 joule
The total energy is the sum of the energy of each step.
q = q1 + q2 + q3
= 470.25 + 5016.66 + 2821.5
= 8.30kj
Thus, energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.
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